add proxmox iso share

variables.nix

@@ -103,6 +103,10 @@
       subpath = "raspi/volumes";
       mountpoint = "/mnt/raspi-backup";
     };
+    proxmoxVolumes = {
+      subpath = "proxmox/iso";
+      mountpoint = "/mnt/iso";
+    };
   };
 
   # The Raspberry Pi's own NFS export — not under storageRoot/nfsServerHost,